The "blue-bulge" infall signature toward IRAS 16293-2422

Gopal Narayanan, Christopher K Walker, Henry D. Buckley

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We present the first detection of the "blue-bulge" infall signature toward a protostellar source. The blue-bulge infall signature can be observed in the centroid velocity maps of protostellar objects when infall dominates over rotation. This infall signature can be detected under a wide variety of source conditions. The detection of the blue-bulge infall signature toward a protobinary system such as IRAS 16293-2422 suggests that detailed studies of gravitational collapse toward a large number of protostellar sources may now be possible. Our CS J = 1 → 6 data appear to be tracing gaseous material in the inner circumbinary core, while the CS J = 5 → 4 and HCO+ J = 4 → 3 appear to trace the outer envelope and static core in addition to the inner circumbinary core. The mass accretion rate through the infall region appears to be consistent with an inside-out collapse model for the source. Using three-dimensional radiative transfer models based on the rotating, collapse solution of Terebey, Shu, & Cassen, we derive the infall parameters of the IRAS 16293-2422 cloud core. Our best-fit model suggests that the infall radius of the IRAS 16293-2422 cloud core is ∼39″ (0.03 pc).

Original languageEnglish (US)
Pages (from-to)292-310
Number of pages19
JournalAstrophysical Journal
Volume496
Issue number1 PART I
DOIs
StatePublished - 1998
Externally publishedYes

Fingerprint

Infrared Astronomy Satellite
inner core
signatures
radiative transfer
accretion
gravitational collapse
tracing
centroids
envelopes
radii
detection

Keywords

  • Circumstellar matter
  • ISM: Clouds
  • ISM: Individual (IRAS 16293-2422)
  • Sequence
  • Stars: Pre-main

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The "blue-bulge" infall signature toward IRAS 16293-2422. / Narayanan, Gopal; Walker, Christopher K; Buckley, Henry D.

In: Astrophysical Journal, Vol. 496, No. 1 PART I, 1998, p. 292-310.

Research output: Contribution to journalArticle

Narayanan, Gopal ; Walker, Christopher K ; Buckley, Henry D. / The "blue-bulge" infall signature toward IRAS 16293-2422. In: Astrophysical Journal. 1998 ; Vol. 496, No. 1 PART I. pp. 292-310.
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